"I have the same goal, play the same as I did when I was Number 2. When I was Number 2, I was very happy. I am very motivated to play the tournament, not to be Number 1. Right now I am trying to play a very good tournament to win the US Open," he said.

In another match Frenchman Gael Monfils too went through to Round 2 with a straight set win over Pablo Cuevas.

Meanwhile, ninth seed James Blake survived a scare to beat countryman Donald Young in a thrilling five-setter. Blake won the first set 6-1 but Young came back in the second to take it at 6-3. The next two sets were shared before Blake kept his nerve to win the fifth set 6-4.